Which triangle has three angles less than 90 degrees and exactly two congruent sides

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at link to the chart is here

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18

Use the distributive property -7(-2x+u-2)